REST API to Apex generator (similar to WSDL 2 Apex)
It would be great if there was a mechanism in SF that allowed a developer to dynamically build an Apex class for interacting with RESTful API's, instead of manually building a class manually with painstakingly tedious implementation.
Many of the most heavily utilized API's in the industry, such as Facebook, Twitter, and LinkedIn all use RESTful API's with no automatable integration structure (like WSDL). In cases like these, it would be great if there was an interface in Salesforce that allowed a developer to define the parameters to make each RESTful API call, and have code generated to properly implement that web service request via Apex. This generator shoudl also take into account a level of code reusability/modularity, so that it is efficient across the space of a class.
I think a tool like this would allow more developers to take Salesforce integration to a whole new level, without the tedium of manually implementing a hand-crafted API integration for each API they wish to consume via Apex.